Malicious PDF — malware analysis report

Static analysis result for SHA-256 13108f3792c12912…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 06:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d16aee7fd17beda0b61c1a245fb354d6 SHA-1: 9567f3e183277ee341e1443a9dc5eab87c90d6bf SHA-256: 13108f3792c129128e8214f9d138976ff638059676ae2ca45c011cf0a8f70063
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect with a remote-support tool. This, combined with the numerous embedded URLs pointing to potentially compromised or disposable hosting, suggests a phishing or social engineering attack aimed at gaining system access. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/92738bd556f778d70651f7a0eb6db18c/fivepibagikeduwegixawode.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dogikoji.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/91441478169.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/51872533535.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/58768001543.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798efac2525---81936149655.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68e27cb44---mejek.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/49392380488.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5253cf84040d6f34e8cf7a188d172f58/54095066243.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073100472edf---50265624346.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271825026782.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/wonunagewaxapuvapitodokek.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/86f4786457639ffb22924e529a7c1199/53006152686.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce7003c09---zegipetimevi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f62ea7be---57449784432.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/99379238166.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mg5so8lpv4hq8d77aupo3hdiae/35038914051.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/96f1c1c136bf9a57901845a28e077bd8/1571710316.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160db66850e42f---71472088126.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606da720d50b2---3889307227.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/43856579421.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/ddd9e40150b55c51bd828b264da6d020/21394839553.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/56465419150.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/84003459253.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xesalelogevubisut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=womens+shaved+undercutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 16992 bytes
SHA-256: 849d29c68421316eac4473642aaabd1a8d6cdc7c935404d25605853a3ea60b33
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 10656 bytes
SHA-256: 1e11992f6d2d3759d999cfd31093c5a3ec8607305151dd3ee392b0986b3a0579

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